Playposit (formerly known as eduCanon) - a tool to create and share interactive videos for active learning. 

An example of interactive video by PlayPosit

EDpuzzle - a quick intro video as below. Free app available in iOS.

Educreations - Educreations is a unique interactive whiteboard and screencasting tool that's simple, powerful, and fun to use. Annotate, animate, and narrate nearly any type of content as you explain any concept. Free app available for download in iTunes.

TED-Ed - a tool to build a lesson around any Ted-Ed original, Ted Talk or YouTube video. You need to register a free account first. 

PowToon - a tool to create animated videos and presentations.